.posi{
    margin:44px 0 49px;
}
.sb{
    width:100%;
    height:830px;
}
.sb .nav{
    width:368px;
    height:100%;
    float: left;
}
.sb .nav .nav-item{
    width: 368px;
    height:137px;
    margin-bottom: 20px;
    color:#989898;
}
.sb .nav .nav-item h3{
    color:#6b6b6b;
    font-size: 18px;
    line-height: 17px;
    margin-bottom: 8px;
}
.sb .nav .nav-item span{
    font-size: 12px;
    line-height: 10px;
    display: block;
    margin-bottom: 18px;
}
.sb .nav .nav-item p{
    font-size: 14px;
    line-height: 20px;
}
.sb .sb-r{
    float: right;
    width:750px;   
}
.sb .sb-r img{
    float: left;
    margin-bottom: 30px;
}
.sb .sb-r .mr0{
    margin-bottom: 0;
}